package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("删除图书");

        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要删除的书名：");
        String name = scanner.nextLine();

        int pos = -1;
        int currentSize = bookList.getUserSize();
        int i = 0;
        for (; i < currentSize; i++) {
            Book book = bookList.getBook(i);
            if(book.getName().equals(name)){
                pos = i;
                break;
            }
        }

        if(i == currentSize){
            System.out.println("找不到 "+name+" 这本书！");
            return;
        }
        //开始删除
        int j = pos;
        for (; j < currentSize-1; j++) {
            //j = j + 1;
            Book book = bookList.getBook(j+1);
             bookList.setBook(j,book);
        }

        bookList.setBook(j,null);

        bookList.setUserSize(currentSize-1);
    }
}
